Set up hdmi output device default volume to 100.

chromeos/audio/audio_devices_pref_handler.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROMEOS_AUDIO_AUDIO_DEVICES_PREF_HANDLER_H_
 #define CHROMEOS_AUDIO_AUDIO_DEVICES_PREF_HANDLER_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "chromeos/audio/audio_pref_observer.h"
 #include "chromeos/chromeos_export.h"
 
 class PrefService;
 
 namespace chromeos {
 
 struct AudioDevice;
 
 // Interface that handles audio preference related work, reads and writes
 // audio preferences, and notifies AudioPrefObserver for audio preference
 // changes.
 class CHROMEOS_EXPORT AudioDevicesPrefHandler
     : public base::RefCountedThreadSafe<AudioDevicesPrefHandler> {
  public:
   // Gets the audio output volume value from prefs for a device. Since we can
   // only have either a gain or a volume for a device (depending on whether it
   // is input or output), we don't really care which value it is.
-  virtual double GetVolumeGainValue(const AudioDevice& device) = 0;
+  virtual double GetOutputVolumeValue(const AudioDevice* device) = 0;
+  virtual double GetInputGainValue(const AudioDevice* device) = 0;
   // Sets the audio volume or gain value to prefs for a device.
   virtual void SetVolumeGainValue(const AudioDevice& device, double value) = 0;
 
   // Reads the audio mute value from prefs for a device.
   virtual bool GetMuteValue(const AudioDevice& device) = 0;
   // Sets the audio mute value to prefs for a device.
   virtual void SetMuteValue(const AudioDevice& device, bool mute_on) = 0;
 
   // Reads the audio capture allowed value from prefs.
   virtual bool GetAudioCaptureAllowedValue() = 0;
@@ skipping 11 matching lines @@
  protected:
   virtual ~AudioDevicesPrefHandler() {}
 
  private:
   friend class base::RefCountedThreadSafe<AudioDevicesPrefHandler>;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_AUDIO_AUDIO_DEVICES_PREF_HANDLER_H_